python – 在SQLAlchemy中使用cdecimal

所以我试图使用cdecimal在我的数据库中存储货币值.
SQLAlchemy Doc

import sys
import cdecimal
sys.modules["decimal"] = cdecimal

我连接了我的PostgreSQL数据库,如下所示:

sqlalchemy.url = postgresql+psycopg2://user:password@host:port/dbname

我已经设置了这样的模型:

class Exchange(Base):
    amount = Column(Numeric)
    ...

    def __init__(self, amount):
        self.amount = cdecimal.Decimal(amount)

但是,每当我这样做时,我都会收到以下错误:

ProgrammingError: (ProgrammingError) can't adapt type 'cdecimal.Decimal' 'INSERT INTO...

我究竟做错了什么?

最佳答案 这个适合我,请试试这个

import sys 
import cdecimal
sys.modules["decimal"] = cdecimal

from sqlalchemy import create_engine, Numeric, Integer, Column
from sqlalchemy.ext.declarative import declarative_base

engine = create_engine('mysql://test:test@localhost/test1')
Base = declarative_base()


class Exchange(Base):
    __tablename__ = 'exchange'
    id = Column(Integer, primary_key=True)
    amount = Column(Numeric(10,2))

    def __init__(self, amount):
        self.amount = cdecimal.Decimal(amount)


Base.metadata.create_all(engine)
from sqlalchemy.orm import sessionmaker
Session = sessionmaker(bind=engine)
session = Session()


x = Exchange(10.5)
session.add(x)
session.commit()

注意:我的电脑里没有pgsql,所以我尝试了mysql.

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